"They don't like being charged generally over 80 to 90 percent, and they really don't like being undercharged below 20 percent," said Charlie Hoover, of the Boston Tech Collective.

Hoover said keeping a low charge kills battery life.

In terms of what's on your phone, he said to save your photos in at least two places."Pictures are irreplaceable, really. You can rebuild an address book. You really can't rebuild a photo collection," he said.

Your home computer is a good backup, but also back up to a cloud. Make sure you protect your account.

"Make sure that you're at least securing your account with as much protection as they will allow, things like two-factor authentication," he said.

Protect from thieves by requiring a longer passcode to open your phone. Change it from the simple four-digit option.

"You can make it an actual passcode or you can make it a PIN code," he said.

A password with a mix of letters and numbers, even symbols, is safest.

It should be at least six characters for a phone. Otherwise, make sure passwords are at least 10 to 12 characters to combat hackers.

"They have databases full of passwords that are commonly used -- so they know that monkey123 is actually a very popular password for some weird reason," he said. "They can try thousands or millions of passwords in a second."

He suggests using a password manager service to generate complex passwords, save them and enter them for you.